EP 1662653 A1 20060531 - Demodulator of frequency modulated signals
Title (en)
Demodulator of frequency modulated signals
Title (de)
FM-Demodulator und Verfahren dazu
Title (fr)
Démodulateur-FM et procédé
Publication
Application
Priority
JP 2004337062 A 20041122
Abstract (en)
To present a demodulator of frequency modulated signals and a demodulating method of frequency modulated signals capable of demodulating frequency modulated signals having frequency deviation favorably. An input signal SIN (f±fDEV) having frequency deviation (±fDEV) from carrier frequency (f) is inputted in a signal converting unit 1, and an input square signal SSQ (f±fDEV) having same frequency as fundamental frequency is outputted. The input square signal SSQ mainly containing odd-number degree higher harmonics at fundamental frequency is put into a decoder 3, together with first signal SR (N × f) outputted at N times (N being 2 or greater natural number) of frequency of carrier frequency (f) from a signal output unit 2. The input square signal SSQ is converted by quadrature depending on the first signal SR, thereby producing two signals SI and SQ which are signals of N times of frequency (N × fDEV) of frequency deviation, inverted in phase difference by 90 degrees depending on the deviation. These two signals SI and SQ are logically operated and demodulated.
IPC 8 full level
H03D 3/00 (2006.01)
CPC (source: EP US)
H03D 3/007 (2013.01 - EP US)
Citation (search report)
- [A] WO 0119047 A1 20010315 - KONINKL PHILIPS ELECTRONICS NV [NL]
- [A] US 4766392 A 19880823 - MOORE PAUL A [GB]
- [A] US 2004207464 A1 20041021 - PETROVIC BRANISLAV [US], et al
- [A] US 4893316 A 19900109 - JANC ROBERT V [US], et al
Designated contracting state (EPC)
DE FR
DOCDB simple family (publication)
EP 1662653 A1 20060531; EP 1662653 B1 20090311; DE 602005013174 D1 20090423; JP 2006148627 A 20060608; US 2006111073 A1 20060525
DOCDB simple family (application)
EP 05003498 A 20050218; DE 602005013174 T 20050218; JP 2004337062 A 20041122; US 6397305 A 20050224